Nanosiren garciae is an extinct sirenian dugong that lived in warm shallow seas in what is now Venezuela, approximately 11.610—3.6 Ma during the Miocene and Pliocene.

[2] In their book, Ecology and Conservation of the Sirenia: Dugongs and Manatees, authors Helena Marsh, Thomas J. O'Shea and John E. Reynolds III, describe the evolution of Nanosiren garciae from the Crenatosiren lineage, and argue that their small size allowed them access to very shallow water unavailable to larger sea mammals.

[4] Nanosiren was named in 2008 based on fossils uncovered from the Bone Valley Formation near Tampa, Florida.

Its small size gave rise to the naming of its genus as Nanosiren, from the Greek for a "dwarf siren".

A map of locations where fossils of Nanosiren garciae has been created, ranging from Chile and Peru in South America to the United States, can be found at the Global Biodiversity Information Facility.